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ACPI / init: Invoke early ACPI initialization later 

Commit 73f7d1ca32 (ACPI / init: Run acpi_early_init() before
timekeeping_init()) optimistically moved the early ACPI initialization
before timekeeping_init(), but that didn't work, because it broke fast
TSC calibration for Julian Wollrath on Thinkpad x121e (and most likely
for others too).  The reason is that acpi_early_init() enables the SCI
and that interferes with the fast TSC calibration mechanism.

Thus follow the original idea to execute acpi_early_init() before
efi_enter_virtual_mode() to help the EFI people for now and we can
revisit the other problem that commit 73f7d1ca32 attempted to
address in the future (if really necessary).

Fixes: 73f7d1ca32 (ACPI / init: Run acpi_early_init() before timekeeping_init())
Reported-by: Julian Wollrath <jwollrath@web.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
wifi-calibration
Rafael J. Wysocki 2014-03-13 00:22:58 +01:00
parent fa389e2202
commit c4e1acbb35
1 changed files with 1 additions and 1 deletions
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2
init/main.c
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@ -561,7 +561,6 @@ asmlinkage void __init start_kernel(void)
init_timers();
hrtimers_init();
softirq_init();
acpi_early_init();
timekeeping_init();
time_init();
sched_clock_postinit();
@ -613,6 +612,7 @@ asmlinkage void __init start_kernel(void)
calibrate_delay();
pidmap_init();
anon_vma_init();
acpi_early_init();
#ifdef CONFIG_X86
if (efi_enabled(EFI_RUNTIME_SERVICES))
efi_enter_virtual_mode();